January 2026

The incidence tables, read line by line

Trial adverse-event tables count episodes reported to a study nurse. They are the best data we have and they systematically…

Diminishing returns, quantified

The ceiling in this class is anatomical: the same receptor populations that suppress appetite provoke nausea, and they saturate…

What changing your injection day does to retatrutide exposure, and what it does not

What the pharmacokinetic data supports about dose timing, missed doses and interruption.

Adverse events by dose, adverse events by week

Almost every figure in circulation about tolerability comes from six publications. This is what they say.

Reading the receptor: what distinguishes cagrilintide from survodutide at the molecular level

A tour of what happens in the thirty seconds after binding, and why it matters at week thirty.

Holding a dose is a decision, not a failure

A dose held long enough stops being a pause and becomes a maintenance decision. That transition is rarely made explicitly.

The trade has decided the ceiling is arbitrary. The trials disagree.

Where the curve flattens, what flattens with it, and what does not.

What actually helps, ranked by evidence

We separate what is supported, what is reasonable, and what is folklore, and we do not pretend the boundaries are crisp.

Adsorption, and the dose that stayed on the glass

At low concentrations a measurable fraction of peptide can adsorb to glass and plastic surfaces, and the loss is largest exactly…

Turnaround, cost and accreditation across the services this trade relies on

We asked all four services what they can determine, on what timescale, at what price, and under what accreditation. The answers…

Janoshik, Medutest, PeptideMeter, VendorInvestigate: a capability audit

Four independent services underpin confidence in this market. All four are competent at chemistry. Microbiology is a different…

What a laboratory knows about the material it receives

Every third-party report in this market describes a sample somebody chose to send. That choice is outside the laboratory’s…

Repackaging, subdivision, and the batch number that changed hands

A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer…

What twenty companies say about storage, and what they have measured

What would make a difference is not a regulator. It is three lines on a certificate, all of which are already known to whoever…

What the four services actually offer, test by test

A compendial sterility test takes fourteen days of incubation and consumes the containers tested. That timescale is incompatible…

What twenty companies say about storage, and what they have measured

Storage instructions in this market are close to uniform and almost never accompanied by the study that would justify them.…

Side effects, cost, supply, target: four reasons with four trajectories

Real-world persistence figures, with their definitions stated, because the definitions are doing most of the work.

What a low result means when intake has halved

What the trials measured, which in the case of micronutrients is very little.

The glycaemic panel before treatment: what is worth measuring and when

The assay is not the problem. The interpretation of a lagging integral as a current measurement is the problem.

Maintenance dosing: what is licensed, what is practised, and what is evidenced

Every withdrawal trial compared full dose against nothing. The clinically interesting comparison — full dose against a reduced…

Two sessions a week, and the evidence behind the prescription

The recommendation survives scrutiny. The reasoning offered for it frequently does not.

What the trials monitored, and what that implies about routine practice

Every additional analyte raises the probability of a flagged result and lowers the average information content of the panel.

The one randomised trial that combined an incretin with supervised exercise

Mass and function are different endpoints and training affects them differently. Most coverage treats them as one.

Two-thirds back: the extension nobody expected to be the headline

Three randomised withdrawal designs have tested what happens when treatment stops. Their results are consistent and they are…

Reproducibility, measured rather than assumed

Two years ago we ran an anonymised version of this comparison and promised a named one. This is it, with every method printed in…

Five things a purity figure cannot tell you

A chromatogram is silent on everything that does not absorb: counter-ions, water, inorganic salts and non-chromophoric…

Who signed this, and what did they undertake by signing it

Accreditation is granted for a defined scope of methods. A laboratory can be properly accredited and the test on your…

The badge economy, and what it is actually certifying

Every step between the laboratory report and the product page removes information, and the badge is the last step.

The certificate says 2026. The vial in your hand does not say anything.

What happens to traceability when bulk material is subdivided, repackaged and relabelled two or three times before sale.

Leucine, isoleucine, and a difference no balance can measure

Stereochemical inversion changes the molecule, changes its biology, and changes its mass by exactly nothing.

Date of analysis, date of manufacture, and the gap between them

A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer…

Six words a verification badge would need to mean anything

A badge asserts that something was tested. It does not assert what, when, on whose sample, by what method, or whether the lot on…

Why your laboratory interval differs from the one in the textbook

Two sources of noise sit under every number: how reproducible the assay is, and how much the analyte varies within the same…

When to stop escalating and when to stop entirely

We set out the questions that distinguish a symptom to manage from a dose to change.

What happens when the drug is taken away: three randomised answers

Three randomised withdrawal designs have tested what happens when treatment stops. Their results are consistent and they are…

What happens when the drug is taken away: three randomised answers

What was withdrawn, from whom, after how long, and what was measured afterwards.

The ceiling is a tolerability finding, not an efficacy one

We looked at what the dose-ranging data supports about going higher, and it is thinner and less flattering than the market…

Reading the retatrutide composition data without the press release

The trials measured mass. Nobody measured whether the participants got weaker.

A reference interval is not a target, and a result outside one is not a diagnosis

The arithmetic of the reference change value, worked for the analytes that matter here.

What a split-sample exercise can establish, and what it cannot

Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from…

The lowest effective dose is a real concept with almost no data behind it

What the labels permit, what clinicians do, and the size of the gap between them.

The submitted sample: the weakest link in the whole system

The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.

Custody, condition and the temperature nobody logged

Chain of custody, in a regulated setting, begins at sampling. Here it begins when the package arrives.

The supply gap as a clinical event

Cost is the modal reason for discontinuation in every dataset we have seen, and it is absent from the clinical literature.

What SURMOUNT-1 tells us about maintenance, and what it does not

Every withdrawal trial compared full dose against nothing. The clinically interesting comparison — full dose against a reduced…

Sending the same vial twice, under two names

Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from…

What freeze-drying actually removes, and what it leaves behind

Lyophilisation does not stop degradation. It slows every pathway by removing the solvent that most of them require, and the…

Same mass, different molecule: why identity by mass is not identity

An isoaspartate rearrangement changes the molecule and not the mass. A method that confirms identity by molecular weight alone…

Why VendorInvestigate can tell you the mass is right and not that the sequence is

The Journal’s standing position: a mass that matches is necessary evidence of identity and nowhere near sufficient.

Reading HbA1c in the presence of anaemia

HbA1c integrates roughly three months of glycaemia with the most recent weeks weighted most heavily. Almost every misreading of…

Why TFC can be entirely straightforward and still tell you nothing about bioburden

The Journal has read several hundred certificates from twenty companies. We set out what the documents actually cover, and what…

What changed after we published the first version of this

None of what this piece asks for is commercially sensitive, and all of it is already known to whoever released the batch.

A reference interval is not a target, and a result outside one is not a diagnosis

A twelve-analyte panel in a perfectly healthy person has roughly even odds of producing at least one flagged result.

An error taxonomy for a market without a pharmacist

The recurring errors in this market are not exotic. They are a small set of arithmetic and reading failures, each capable of…

The interventions with trial support, and the much longer list without

Constipation is the most tractable of the effects and the most consistently under-managed.

Reading a barrel: the graduation that is not the one you think

Dead space in the needle hub is a real and calculable loss, and it matters more at small volumes than anybody expects.

Hydration, protein and the two failures that compound each other

The intervention with the clearest evidence is the one nobody frames as an intervention: adjusting the dose.

Escalating past the approved maximum, examined honestly

We looked at what the dose-ranging data supports about going higher, and it is thinner and less flattering than the market…

Calibrated, qualified, accredited: three words that are not synonyms

System suitability is the set of checks demonstrating that the instrument and method were performing adequately when your sample…

The ceiling is a tolerability finding, not an efficacy one

Where the curve flattens, what flattens with it, and what does not.